A skin preparation before surgery (antiseptic shower) and surgical (debridement and antisepsis of the operative field) will be performed. The intervention will begin with a thorough exploration of the entire peritoneal cavity and gallbladder to confirm the macroscopic diagnosis of CAL. The treatment consists of cholecystectomy with complete choice of surgical approach is left to the discretion of the operator. The laparoscopic route is preferred. The realization of a systematic sampling biliary be to compare the germs found in the gallbladder and any germs found in postoperative complications. The achievement of intraoperative cholangiography will be left to the discretion of the surgical team. The need for surgical drainage (aspiration or not) will be left to local conditions and customs of the service. The operating time will be recorded and analyzed. These variables will be collected for statistical analysis (CRF).